imgix launched the Chester Face feature, which we're providing to our customers as an AFaaS (April Fools as a Service) option:

http://blog.imgix.com/post/115195342369/new-imgix-feature-ch...

Chester Face is a tool that will automatically detect any faces in your imagery and replace those faces with that of Chester.

(Chester is an engineer's cat, who happens to be photogenic and comes out of the box in the correct shade of orange for our branding)